1. True Believers — People whose extremism arises from a sincere belief in the extreme ideology being promoted.

2. Needle-Pushers — Cynical practicers of realpolitik who adopt the extreme position hoping to counteract extremists on the opposing side and “move the needle” toward their own position, getting partisans in power or policies enacted that are more desirable from their point of view.

3. Knee-Jerkers — Followers who are led to back an extremist position because that position’s arguments speak to their own prejudices or harmonizes with their cultural background.